EM Waves & LASER — A/L Physics

How do I practise EM Waves & LASER?

1 question with a worked solution

1. Which combination of optical properties distinguishes LASER radiation from conventional thermal light sources?
   1. A) Longitudinal polarization with isotropic omnidirectional divergence
   2. B) High temporal and spatial coherence, monochromaticity, and extreme directional collimation
   3. C) Zero photon momentum and zero energy density
   4. D) Broad continuous spectral emission, complete incoherence, and high divergence
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   Correct answer: B) High temporal and spatial coherence, monochromaticity, and extreme directional collimation

   LASER (Light Amplification by Stimulated Emission of Radiation) light is produced by stimulated emission in a population-inverted gain medium. It exhibits extraordinary spatial and temporal coherence, high monochromaticity (narrow linewidth), and low beam divergence (collimation).

   Show worked solution

   Step 1: Identify LASER characteristics: Coherent, Monochromatic, Directional, High intensity. Answer: High temporal and spatial coherence, monochromaticity, and extreme directional collimation.
   Modelled on: the A/L Physics examination pattern

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Where does EM Waves & LASER fit in the syllabus?

Unit 3.7 · Year 1 · Term 2